RCA 88-A

This was the microphone predominently used in the Nuremberg Trials

From the RCA catalogue of 1939

THE TYPE 88-A Pressure microphone excels in the four requisites of an ideal remote pickup microphone, namely; light weight, high output, good frequency response and freedom from the effects of wind and moisture. Tipping the scales at but one pound it is truly the remote pickup man's ideal microphone. In spite of its light weight and small size, it is extremely rugged and well-suited to stand the hard usage to which a remote microphone is put. The high output, -46 VU keeps the signal-to-noise ratio in any remote pickup at least 6 db. better than ever available in a microphone of this quality. The frequency response as shown below extends from 60 to 10,000 cycles with remarkably few peaks usually found in a pressure or inductor type microphone. Its diaphragm of molded styrol is practically impervious to moisture and together with the wind screen supplied with this microphone makes the effects of objectionable currents of air practically unnoticeable. Like all RCA microphones it is styled and finished in a manner which will make you proud to use it under any circumstances.

Not only is the type 88-A pressure microphone ideal for remote pickups, but also because of these very qualities it is excellent for many types of studio use where a non-directional microphone is desirable. Not content with making a microphone of this quality, RCA engineers have designed it to sell at a surprisingly low cost in comparison with any type of microphone.

SPECIFICATIONS

Output Impedances: 50/250 ohms

Output Level: -46 VU

Frequency Response: See curves

Finish: Polished black and chromium

Mounting: ½" pipe thread

Dimensions: Overall length 4½"; width 2⅛"; depth 4"

Weight: 1 lb.

MI-4048 supplied with 6' shielded cable, less plug.

MI-4048-A supplied with 30' shielded cable, less plug.

The RCA Broadcast Equipment Catalog from 1939 contains a page about the 88-A